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Old Dec 06, 2003, 11:58 PM
socalflyer
laguna niguel Ca.
Joined Apr 2002
48 Posts
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Need advice on high grade power supply for ISL-8

Does anyone know of a nice power supply that doesn't cost an arm and a leg? I need a power supply according to my Schultze's instuctions that "can supply 34-45 amps continuous and is well regulated, and has has a very high output capacitance (>5000uF/16V), very low ripple and is insensitive to the frequency of the chargers' internal switching voltage converter"


Whatever that all mean
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Old Dec 07, 2003, 03:33 AM
f5b-uk
Mike Seale's Avatar
United Kingdom, Dorset
Joined May 2002
3,064 Posts
You only need a 45A PSU if you're going to be using both outputs on large packs at the same time. I have a 25A PSU which works fine with the isl8. It was bought in the UK and has a 'Watson' badge on it. The only problem I have is that the PSU sees the isl8 as a short circuit when first connected and turns itself off. I ovecome this by connecting with a 1ohm resistor in series and then shorting out the resistor as soon as connected. A bit of a chore, but it works.
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Old Dec 07, 2003, 10:04 AM
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Muah's Avatar
Singapore
Joined Jan 2001
736 Posts
lead-acid battery

The way I got around this is to use a lead-acid battery and a small wall charger for the lead-acid battery. And the cool part is if you are using more than 15 cells on the first output, the energy you get from discharging them actually chargers your lead-acid battery instead of dissipating it entirely as heat! Just remember to get a deep-discharge type so that it can take the deep discharging-charging cycles. Also you don't have to worry about voltage spikes damaging your charger. But in no event should you have the both chargers hooked up to the lead acid battery. It is also stated in the manual to not use the lead acid battery as a 'float' when you are using it to power your charger.
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Last edited by Muah; Dec 07, 2003 at 10:07 AM.
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Old Dec 07, 2003, 12:59 PM
socalflyer
laguna niguel Ca.
Joined Apr 2002
48 Posts
I have a deep cycle marine battery on a Battery Tender for maintaining it's charge, but I want a power supply that enables my ISL-8 to charge on all three outputs continuously, a 16 -20 cell pack on output 1 and 2 and the 3rd output for charging reciever batterys.

If I were using the charger like that I would like to err on the side of more amps.
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Old Dec 07, 2003, 04:48 PM
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Bill Glover's Avatar
United Kingdom, Bracknell
Joined Nov 2000
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I don't think you're going to get a power supply like that without paying some serious money, the 40A one Schulze recommend is 205 Euros incl. tax ($250 US)!

I only run my ISL 8 from a big leisure battery (even at home), which I recharge immediately after each session.
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Old Dec 07, 2003, 05:14 PM
socalflyer
laguna niguel Ca.
Joined Apr 2002
48 Posts
Bill,

Where did you find the power supply recommended by Schultze?

Byron
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Old Dec 07, 2003, 07:32 PM
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Muah's Avatar
Singapore
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Schulze PSU
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Old Dec 07, 2003, 08:31 PM
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Joined Dec 2003
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Byron,
My advice is to look around on Ebay. I got a great deal on an excellent power supply there. Below is the link to the one I purchased. It should work fine for you as I have used it to simultaneously charge batteries using 5 separate chargers.

http://cgi.ebay.com/ebaymotors/ws/eB...tem=2441232805

Jerry
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